code: def stop(self):
      self.__server.shutdown()
  
file_path: pyalgotrade/testcases/websocket_server.py
imports: import threading
  from wsgiref import simple_server
  from ws4py.server import wsgirefserver
  from ws4py.server import wsgiutils
label_desc: Use image node_id 3 for calling the WebSocketServerThread obj's underlying member method code with example usage: obj.stop() without return types